Adding-machine.



J. G. VINCENT.

ADDING MACHINE. APPLIUATION ULEB JUNE'l, 1907.

Patented Jan. 26, 1909.

8 SHEETS-SHEET 1.

J. G. VINCENT.

ADDING MACHINE,

APPLICATION FILM: JUNE 21,190?.

91 0,749. Patented Jan. 26, 1909.

B SHEETS-SHEET 2.

J. G. VINCENT.

ADDING MAUEINE.

APPLxoATIoN FILED .mlm 21,1901.

Patented Jan. 26, 1909.

8 SHEETS-SHEET 3.

5. G. VNCENT.

ADDING MACHINE.

APPLICATION FILED JUNE 21, i907.

J. G. VINCENT.

ADDING MACHINE.

APPLIMTIDN FILED Jun 21,1907.

Patented Jan. 26, 1909.

8 SHEETS-SHEET 5.

* J. G. VINCENT.

ADDING MACHINE.

PPLIUATION FILED .man 21,1901.

910,749. mam aan. 2e, 1909, E Ms Y usaran-unam e.

910,749. Patented .161126. 1901;`

B SHEETS-SHEET 'A'. 72

565 5.67 404 15. 36* SEPARATE ToTAL 7.09 1.26 4.65 1.3. o3# SEPARATE Tom.

2.59 :.26 7'09 1a 73 i sEPAnATE mTAL 4112# GRAND ToTAL -15@ 1.9

.-f. 4.69 X60/4 7. L.,/ 9 75 1.94 6 82 8. 33 2.67 8. 0 4 31. 96# SEPARATE ToTAL 3. 7a

. 7 o2 6. 79 5.62 461 5. o7 A 56 249 6. 54 5.69 5. 41 6. 74

6. 7a 2 7. 91;!E SEPARATE ToTAL 5. 6 9 9.64 "g, 3.02 '58 6. oo

:e 2 8' o3 SEPARATE TOTAL 6 5. 3 7 'ff 4 9.82 *i* GRAND TOTALS L 61 652 7. 5 1 1.6 9 4. 4 2 7 169.114) 2160 SEPARATE TOTAL 4.5 9 10 9.504` GRAND ToTAL 4.5 9 'I 0 5 4.o 6 704 2733* sus ToTAL 50e 501 a 94 ,74/ A G5565 4636 E sua ToTAL Y fnl/.07%,

4.69 'I L V' f 8.53 .l/4 537 A, xm 74M' d. G. VINCENT.

ADDING MACHINE.

APPLICATION FILED JUNE 21,1907.

6 4. 95 @me mm VLA.;

J. G. VINCENT. i ADDING MACHINE.

APPLIUATIOK FILED JUNE 21, 1907. 91 0,749. Patented Jan. 26, 1909.

s enzym-SHEET 3. 3J

UNITED STATES PATENT OFFICE.

JESSE G. VINCENT, 0F DETROIT, MICHIGAN, .ASSIGNOR TO BURROUGHS ADDING MACHINE COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN ADDING-MACHINL Patented Jan. 26, 1909.

Application lcd June 21, 1907. ,Serial Nrn-380,124.

To alliwhom it ma/y concern:

Be it known that I, Jnssn G. VnvoENr, a citizen of theUnited States, residin at De troit, in the county of Wayne and tate of Michigan, have invented certain new 'and useful Improvements in Adding-Machines, of

which the following is a description, refer` thereof, such as the well-known Burroughs addingand listing machine, constructed under and in substantial accordance with Let ters Patent of the United States Nos. .504,963 and 505,078, issued u on the applications of William S. Burroughs on September l2, 1893, and No. 823,474, issued upon the application of Alvan Macaulay on. June 12, 1906.

The Burroughs machine, constructed un der and in accordance, with the above mentioned' patents, and other similar machines now 'u on the market, --are capable of and regular y em lo ed for listing and accumulatin-g indivi ua items or amounts in vertical columns, and printing totals or subtotal@ thereof when desired. In the taking of totals the accumulating Wheels are returned to and left in initial or zero position, thereby clearing" the machine; while in taking Subtotale the accumulating wheels are left in the positions to which they have been advanced in accumulating the amount of the subtotal, and the latter is included in the `next subtotal or total that may be taken, so t that if,a series of4 subtotals be taken in succession, before taking a final or grand total, each subtotal will include the amount of all preceding Subtotale, as will also the final or fhgpneans of which attire end of operations a v'ltjidltotal of all of the items, or of all of the Separate totals, may he taken..1 ,Y Another purpose of my invention ist@ pm'.

vide means in machines of this class whereby cross accumulating Work may be done, and the sum of a series of items in a horizontal line he rinted at the right hand end of the line, ang the aggregate sum or total of auch line-totals be printed at the foot of the col.- umn of line-totals at the end of operations.

Another object of my invention is to equi machines of this class to list and iudcpendKZ ently accumulate two 'separato columns .of items or amounts, such as debit and credit items, and print the totals ofthe respective columns at the oots thereof.

I have illustrated 'my invention as ein bodied in the Well-known Burro hs machine, and I have provided novel and efiicient mechanism for equipping such a mae chine for the various sorts of Work'referred to, without interfering with its normal and familiar operatic@ and use; but my inven. tion is not limited'in its application or scope 'to the Burroughs machine, but may be este bodied in other machines of the same general class, for the same purposes and with the same results.

In the accon'ipsnying drawings, Figure 1 .is an elevation of the right side of a Burroughs adding and listing machine, partly in section, showing the ap Jlication of my improvements to the regu ar machine; Fig. 2 is an enlarged detail elevation or portion of the left-` hand side of the machine Fig. 3 a front els` vation of a portion of the machine, partly in section; Fig. 4 a detail front elevation; Figgo a detail side elevation of some of the parte 'of'.

Fig. 4, being a view taken approximately on the line 5--5 of Fig. 4; Fig. 6 a detail view of some of the arts shown in Fig. 5 and under a difleient a( justment; Fig. i a view corre spending to Fig. 6 with the parts in another adiustment; Fig. 8 a detail lan view of the looking device for the contro ing keys; Fig. 9 a perspective view of one of the sets oi accu` mulating Wheelaand Figs. l0 and ll similar views of separate parte thereof; Figs.` 12, 13, 'i4 and 15 examples of some of the listing or printing operations of a machine equip ed with n1 improvement; and Figs'. 16 an l?. views illustrating means for p acing the nocumulating mechanism under the automatic 'control of the paper carriage for double col umn work.

The same letters of reference are employed to 1n dicate corresponding parts 1n the several 1. views.

too

Inasmuch as the construction and `operation of the Burroughs adding and listing machineis well known, and is `also illustrated and described in the stents to which l have referred, and in various other atents and pending applications, I will con ine the prcsf ent description, as far as can he conveniently done, to those arts of the machine which are concerned wit my present improvements.

As is well known, the Borroughs machine is provided with a keyboard having a series of keys 291 arranged in parallel rows from front to rear, each row containing nine keys representing the nine digits, and the several rows representing the different denomina-v tions in value in regularly increasing order from right to left. The keys 291 are arranged to o )crate or control a series of stop wires 270, `igs. 1, 2 and 3, whose laterally bent front ends are confined and adapted to play backwardly and forwardly in slots in curved plates 210 secured in fixed position in the forward part of the machine. There is a pair of these plates 210 for each row of keys 291 and their corresponding stop wires 270, and the laterally bent front ends of said wires extend across both plates of the pair and fit and play in the coincident slots therein, as best shown in Fig. 3. The front ends of the wires 270 constitute stops for limiting the downward movement of the sectors or rack )lates 610 by which the adding or accu-mulating wheels of the machine are actuated, there being one of said racks located between each pair of plates 210 and adapted to play up and dow. between them. lach of said racks is provided at its upper end with a forwardly projecting hook or shoulder 610, and whenever a key 291 is depressed its corresponding stop wire 270 is drawn rearward and its laterally bent front end thereby brought into the path of downward travel of the shoulder 610 of the corresponding rack 610, with the result that at the subse uent ownward movement of the rack the atter vill be arrested by the stop wire at a point correspondin to the value of the particular key 291 by w lich such stop wire is operated. rl`hcre are ei rht of the stop wires 270 for each row of nine cys, the ninth or rearward key in cach row being unprovided with suche, wire, as a fixed cross rod 205 of the machine takes the place and serves the purpose of a ninth `stop wire for all of therows of keys.

The icks 610 are releasably held in their upper normal positions by the pivoted latches or retainers 415Figs. 1, 2 and 16, each of which latches has a rearwardly extending arm or fin er engaged by the upturncd forward en of a sliding plate-214, there being one of these plates 214 beneath each row of keys 291. lWhen any ke `in a row is depressed the plate 214 is forcev rearwardly and the latch 415 at its front end is thereby disengaged from the corresponding rack 610, to permit the latter to subsequently descend.

The racks 61() are carried by the lower for ward ends of levers 611, which latter are hung about midway of their length upon the shaft 600 and extend rearwardly therefrom and have their rear ends widened out into depending sectors which carry the movable t pe lates 618 adapted to cooperate with t ie p aten roller v1798 of the paper carriage. The levers 611 are held in the normal position shown, against the stress of springs 685, Fig.1, tending to pull their forward ends downward and elevate their rear ends, by a lifting or restoring frame composed of. two side arms 613 fastened at'their rear ends upon the rock shaft 600, at opposite sides of the machine, Figs. 1, 2 and 5, andA having their lower forward ends connected by a erosslbar-v 617, Fig. 5, underlying the front ends of all of l the levers 611. At each operation of the machine this lifting or restoring frame is swung downward, thereby removing the su )port from the front ends of the levers 61 1 an permitting their springs 685 to draw them downward. As in the regular Burroughs machine, the racks 610 are mounted upon the front ends of the levers 611 by slot-and-pin connections, and 'connected to the levers by sprin s 680, for a purpose hereinafter referre to. f i

The regulai' operation of the Burroughs machine, in listing and accumulating items,

consists in depressing or setting the proper keys 291, to represent the amount of the item, and then pulling forward and releasing the' operating handle of the machine, if it be a hand operated machine. The depression of the keys 291 serves to unlatch the corrie#` spending raek'610 and set the sto wires27() in their paths of movement.I `T e forward movement Aof the operating handle then,

swings the transverse bar 617 of the restoring frame downward, thereb removing the support of the front ends o the levers 611l and permittin the springs 685 to pully them downward an lift their rear ends. The front ends of all of the 'levers 611 will be thereby given an initial downward movement of oneA their racks with them until arrestediby the" stop, wires 270 which ave been drawn into the aths of the shoulders 610 of theirvracks by t e deression of the corresponding keys in the ke oard of the machine. This operation wi elevate the rear ends of the levers' 611 in such manner as to brin -to the printing iine at the iront of the pia en roiiei 'c'' the proper type 618 to print th amount of .the values o of the machine these .the item set up on the keyboard, after which said type 618 will be driven against the platen to efl'ect the printing, by means of the hammers 715, in the manner yfully ex inlined in Patents N os, 505,078 and 823,474` er referred to.. l In the regular Burroughs machine the adding racks 61() lcooperate with a series of ad ding wheel pinions mounted im a ,s frame across the lower forwardv part of the machine, in position to be swung rearward into mesh with the corresponding rachisr 6.10,

and forward out of mesh withthem. In thel regular listing and accumulating operations inions are swung forward and held out o? mesh with the racks during the downward movement of the latter, and are then swung rearward and heldin mesh with the racks during the return -u ward movement of the latter, with the resist that the wheels are turned forward, in one direction onl distances corresponding Lto `the operated keys. In the taking of totals, the inions are swung rearward and held in mes with the racks durin the downward movement of the latter, an

are thereby turned backward by the until the pinions reach zero posltion, Where they are arrested b suitable sto s provided for the purpose. his backwar movement of the pinions and downward movement of the racks serves to position the type 618 at the rear of the machine to print the total which has been accumulated upon the inions prior to their return to zero position. ff the total taken is to be;I grand total, and the machine to be cleared, the pinionsaI-e disezngaged from .the racks rior to the return upward movement of the atter, and conseqlilicntly are left in initial or zero osition at t e end of the operation; while if the total taken is to bea subtotal the pinions are left in mesh with the racks during the return upward movement of the latter, and are thereby turned forward again to the position to which they had been advanced by the previous listing and accumulating operations of the machine.

For the purpose of my present invention I also employ a series of pinions 916 mounted upon a transverse shaft 9'07 extending across the lower forward part of the machine and carried in a swinging frame composed of two side plates or arms 910" and 910B secured at l their lower ends upon the regular rock shaft 900 of the Burroughs machine, Figs. l, 2, 3, 4, 5, 6, 7, 9, 1-0, 11 and 16; and these pinions 916 are swung into and ont of mesh with the racks 610 in substantially the same manner in the regular Burroughs machine, and by means similar to that emplo ed in4 said mar-hin, hereinafter more fu ly explained. li. tht4 present instance, however, these pinions 916, instead of being simply armimulating or adding wheel pinions. as

.will to either one of' twoisets in the' regula-fr Burroughs machine,l are Awhat I may term transmitting pinons, `and are employed for the purpose Agol transmitting the movements of the adding racks 610 at of adding wheels. To this end and for this 'purpose the arrangement more particularly s own in 9, 10 and llfis provided. As there seen, each pinion 916 is embraced upon its foosite sides 'by two number wheels AS B w 'c h are fast upon the inner sides of two notched ldisks or wheels A B loosely mounted`, .upon the rod or shaft907. Each of the'disks or wheels A B is provided upon its innerside with an annular rack, that upon thewheel A being shown at A in Fi 11, and both it and the rack4 B upon t e wheelrB being shown in F' 3. These racks meshlsvith the o posite si es of a beveled inion `916, glich is mounted -u on a ra ial shaft or pivot 9116* journal in the transmitting pinion 916. Under this construction and ar rangement of parts, as will be readily understood, if the Wheel A be held stationary and the inion 916 be turned on its axis, the whee B will lce turned in the same direction Y as the pinion 916, but at twice the s eed and conse uently twice Vas far while if t ewheel B be eld stationaxX Aand the pinion 916 be turned, the wheel will be turned in the same direction as the pinion but at twice the speed and twice as far. By providin means for holding either one of the whees A or B stationary, at will, While leaving the other free to turn, I am enabled to transmit the movement of the corresponding adding rack 610 through the inion 916 to either the wheel A or the Weel B, as desired. The means which I have provided for this purpose' is shown in Figs. 1, 2, 3, 4, 5, 6, 7 and 16. As there shown, I provide a series of detents or locking dogs 926 whichnre carried by and form part of a rigid frame hung at its rear end upon the shaft 900,` and a second series of detents or locking dogs 926" carried by and forming part of a second rigid frame li ewise hung at its rear end upon the shaft 900. The detente 926n are arranged to cooperate with the notched disks or wheels A o the respective pairs of adding wheels, and the detente 926" are arranged to cooperate with the o posite Wheels B of the respective pairs of w eels. Springs 980 connected at their lower ends to the respective detent frames and at their upper ends to fixed studs upon the frame-work of the machine, Figs. 1,72, 3, 6, 7 and 16, tend to pull the forward ends of the detent frames upward and to engage both sets of detente, 926R and 926, with their respective s ets of wheels A and B. For the purpose of controlling the engagementof the detents with the wheelsand maintaining one set of detents outof engagement with its wheels while the other set of detenta is engaged with its wheels, I proiso ' shown in is in the present instance provided with two vide the keys C and D, whose upper ends For the purpose of properly exposing to project through the keyboard of the machine, view and separating the accumulations upon at the opposite forward corners of the latter, the two sets of wheels A3 and B5, I provide and are grovidedwith the key tops or butthe front ol' the machine with a shield or tons C and whose lower ends are proscreen plate F, Fig. 2, having two sets of vided with slots engaging studs upon the res ective detent Yframes 926 and 9261', as s own in Figs. l1, 2, 3, 6, 7 and i6. Bv deu pressing either one of the keys C or D the corresponding detent frame maybe depressed and its detente all disengaged from the wheels A or B.l For the urpose of main? taining either of the keys in depressed prisiticn, afterit has been moved thereto, I provide the latch bar E which is best shown in Fig. S, where it will be seen that it is pivoted midway of its length at E and extends trans veisely across the machine and is pressed by a spring E1B in a direction to cause its o posite ends to cooperate with notches in t e rear and front sides, respectively, ofthe two keys C and D, the notches in said keys being Figs. 2, 6 and 7. Each of the keys o enings, F1 and F2, through the former of wlliich the numbers upon the wheels A3 are exposed to view, and through the latter of which the numbers upon the wheels l 3 are exposed; and to provide for such separate exposure of the numbers noon the two sets of Wheels l have arranged t 1e wheels so that when they are in initial or zero )osition their correspondingt numbers are all oiiset one number s ace from each other, shown in b ig, fi

In the regular Burroughs machine the adding wheel pinions 916 are rovided with ten teeth and thc adding whee s secured to them `are provided with ten corresponding numbers; but in the present case, inasmuch as the number wheels turn at twice the speed as the pinions lllfl, and to twice the extent, as heretofore explained, l provide the pinions 916 with twenty teeth, so that a half revolution of each pinion will` turn the number wheel o erated by it a full revolution, and the num er wheels are accordingly provided with ten numbers and ten notches each.

as clearly notches, the lower one of which is engagedby the barE when the key is in nipper position and the upper one of which 1s engaged by said bar when the key is depressed. Clips or keepers E E* engaging the opposite ends of the latch bar E revent its ends being sprung upward by t e upward pressure exerted on the keys C and D by the springs 980 connected to the detent frames with l, which the lower ends of said keys cooperate.

which and the means 1y which the items listed upon the machine maybe accumulated u on either one of the two sets ol2 adding w eels at will, l will next explain how a series of items may he accumulated u )on one set of wheels, and the total thereof be then printed and the wheels be cleared, and such total he transferred to and preserved upon the other set ol wheels, so that successive series ol items may be listed and accumulated upon the one set of wheels and successive se arate totals he nintcd therefrom and the w ieels cleared, and a fraud total of all of the items, or of all of t e The size and shape of the notches in t ie two keys are such that when either key is )ressed downward the latch bar will be tlihereby oscillated sulliciently to release the opposite key and permit the detent frame controlled by the latter to be drawn upward by its spring 980 and its detents engaged with the corresponding wheels.

As will be' understood from the foregoing l if the key C be depressed and latched in depressed position, the detentsl 926 will al1 be disengaved l A, and the detente Q26L ,e engaged with the 1 wheels B. The wheels B will therefore he locked from movement while the wheels n will he left free to rotate. Under this ad justment of the 1arte, if Ythe machine is description, separate totals, be from the wheels printed at the end ci operations. As heretofore exilaincd, and as set forth in the patents wiich have been referred to, in the regular listing and accumulating operations of the Burroughs machine the adding wheel pinions are maintained out of engagement operated in the or inary way, to accumulate with theadding racks during the downward and list a series of items, such items will all movement of the latter and are held 1n en gagement with them during their return upward movement, while in taking a total on said machine the Jinions are maintained in engagement with the racks during their downward movement, and are held out of engagehe accumulated upon the wheels A and their attached nurnlrer wheels A3, and the latter will expose the amount of such accumulation to view at the front of the machine. 0n the 1 other hand, if the controlling key D be dewill he disengaged 1 ressed the detcnts 926 ment with them. during their return u war rom the Wheels B and the detente 926 be enmovement if the adding wheels are to e left lraged with the wheels A, and under this adl at zero and the machine cleared, but are left rustrnent ofthe parts the items listed will all lin mesh with the racks during their return` e accumulated upon the wheels B and their upward movement il" merely' a subtotal is to attached number wheels B3, and the accumuhe taken and the adding wheels returned to lation be exposed to view by the latter Wheels. l the position which they occupied prior to the Having now explajied the manner in` preserved upon the other set of wheels and taking taking of auch subtotal 'In the present in stance I avail m self of the proviaione for a subtota to enable me to print si total om one set of adding wheels and clear said Wheels, and at the same time and by the same operation to transfer euch total to and reserve it upon the other eet of 'vi-'heele hue, if we assume the controlling key C to be depressed and the machine to he operated to list a seriesof items and accumulate there upon the adding yWheels. A (which carry the number Wheels A3) the total accumulated upon said Wheels may at any time be printed and the wheels be cleared, and the amount of euch total be transferred to the 'wheels B, in the following manner: The regular euhtotal key of the machine (hereinafter referred to) the wheels A will will be de rcesed and the operating handle be drawn orward to its limit of :novena-ent. This will cause the Wheels A to be turned backward to zero position and the types repreeenting the amount of the accumulation upon said Wheels to he brought to the print ing line in the usual manner, after which sind types will be forced against the platen to rint a total representing the amount of tie accumulation upon said wheels. It', now, before the operating handle is released and the adding racks moved upward to norw mal position, the controlling 'ey l) he de ressed, the detente 926" will be dieengagcd .rom the wheels B and the detente 926 he enn caged with the wheels A, thereby locking the latter wheels in their zero or initial position au le ring the wheels B free to rotate; and upon then releasing the operating handle and permitting the adding racks to move upward to normal position the wheels B will be turned forward corresponding distances and the amount of the revious accumulation upon b( transferred to and accumulated upon the wheels B. At the end of the operation, therefore. the wheels A. will be left clear, ready for the accumulation of another` independent series of items, while the totali ol1 the previous series will be carried upon title wheels B. This sequence of operaw tions may be re cated indefinitelyand a rand total then lie printed from the wheels by operating the machine in the usual manner for the taking of a gre-nd total irnmediately after the lest separate total here been transferred to the wheels B and While the controlling key D remains depressed.

ln the foregoin explanation I have described the contro ing key D .as being de` pressed by at the end of the forward stroke of the operating handle and downward movement of adding racks, in the operan tion oi printing a separate total from the wheels A and transferring euch tota to the wheels B, and the operation may formed and the result accomplish i manner; but for the purpose of avon necessity of depressing the key D b5' hat g the ed in said operation I provide means for automati ically depressing it at the propertime as a mere incident to the regular operation of the machine the taking of a subtotal. This means is illustrated more particularly in Figs. 2, 6 and 7, and an explanation of it will 1nvolve more,or less ex lanation of the mechanism employed in t e Burroughs machine for engaging the adding Wheel pinions with and dieengaging them from the adding racks,

both in the regular accumulating operations` of the machine and in the o erations of tak ing totals and subtotals. in the re ular Burrou hs machine, so in my improve machine, t 1e upper end of the rocking accumulater frame which carries the adding wheels and their operating pinions 916, and which is hung upon the shaft 900 as before explained, is swung forwardly and backwardly, to disengage the pinions 916 from and rengege them with the racks 610, by means of a forked itman 914 which. is pivoted" at its rear cnil to the depending arm of a threearmed plate 913 hung upon a. stud 941, and whose forward end 1s sul orted upon the lower end of a. link 911, W ich link is in turn connected at its u per end to the bell crank '227 of the total key 293 of the machine,

the link 911 being provided at its upper end with a slot 911 d engaging a stud or screw carricd by the bell crank 227. 293 is yiel din ly held in itsper normal position, Fig. 2, y along coiledpspring 282 connected at its rear end to the depending arm of the bell crank 227, and shown in dotted lines in Figs. 2, 6 and 7; and in this position of the parte the link 911 holds the front end of the pitinan 914 in elevated position, Figs. 2 and 16, in which position a notch in its upper arm or fork engages a. stud 958a upon one of the eide arms or plates 9101 of the Working accumulator frame. In this position of the parte, if the pitman 914 be forced forward it will swing the upper end of the accumulator frame forward and carry the pinions 916 out of mesh with the racks 610, and when the pitrnan is moved rearward again it will carry the pinions backward into rcngagernent with the racks. In the regular operation of the machine for listin and accumulating items the forward end o the pitman is maintained in elevated position, as in Fig. 2, and the pitrnan 914 is forced forwa d at the beginning of the forward stroke o the operating handle, to carr the pinions 916 out of engagement with t e racks 6l0`prior to the downward movement of the latter, and is drawn rearward again at the beginning of the backward stroke of the operating handle to rengage the pinions with the racks prior to the return upward movement `of the latter. The means illustrated in the present instance The total key v for thus operating the pitman 914 are the swung rearward and the wi to which reference has been made, consisting of an arm S13 fast upon the rock shaft 800 and carrying a reversible wiper plate 821 adapted to coperate with studs 961 and 961 a upon the forwardly and rearwardly projecting arms of the three-armed plate 913 to the lower end of whose middle depending arm the rear end of the pitinan 914.- is pivoted. At the beginning of the forward movement of the operating handle of the machine the.

arm 813 carried by the rock shaft 800 is er plate 821 en gages the stud 961 and roc 's the plate 91g slightly upon its pivot 941, from the position of the dotted lines in Figs. 6 and 7 to the position of the solid lines, thereby swinging the lower end of its depending arm forward and forcing the pitman 914 forward to carry the adding wheel pinions out of mesh with the racks. At the beginning of the return move ment of the operating handle the arm 813 is swung forward again, from the position of Fig. 6 to that of Fig. 2. thereby oscillatin the three-armed plate 913 back to its norma position, Fig. 2, and carrying the addin wheel pinions rearward into engagement wit the racks prior to the return upward movement of the latter.

In the operation of taking a total or subtotal the front end of the pitman914 islowered sufficiently to disengage its notched upper arm from the stud 958 before the operatm handle is pulled forward, so that althoug the itman is forced forward as usual its forwar movement will be an idle one and the adding wheel pinions will remain in mesh with the racks darin the downward movement of the latter. f it is desired to leave the adding wheels at zero, and thereby clear thc machine, the pinions will be swung forward, out of mesh with theracks, prior to the return upward movement of the atter; and this is accomplished by lowering the front end of the pitman 914 far enough to cause its iower hooked arm to engage the stud 958 upon the lower end of the rocking accumula tor frame as shown in Fig. 7, so that at the beginning of the backward movement of the operating handle and return rearward movement of the pitman 914 the hooked lower arm of the latter will pull the lower end ofthe adding wheel frame rearward and swing its upper end forward, thereby disengaging the pmions from the racks. rIhis is acconb plished by depressing the total key 293 prior to the forward movement of the operating handle, the depression of such key serving to lower the front end of the itman 914 far enough to permit its lower ooked arm to drop over and engage the stud 958 when the pitman moves forward. lf, on the other land, only a subtotal is to be taken, and the adding wheels are to be returned to the osition which they occupied before the ta ing of such subtotal, their pinions are left in mesh with the racks during both the downward and upward movement of the latter; and to this end,when a subtotal is to be taken the forward end of the pitman 914 is lowered to the intermediate position shown in- Fig. 6, which is suflicient to disengage its notched upper arm from the stud 958 but not sufiioient to permit its lower hooked arm to engage the stud 958, with the result that both the forward and backward movements ofthe itman are idle ones and have no eect upon tlhe accumulator frame. For the purpose of lowering the front end of the pitman 914 to its intermediate position when a subtotal is to be taken, and maintaining it in such position during its forward and backward movement, the subtotal key 293 and ,its connections are provided, such subtotal key being carried upon the upper end of the vertically projecting stern or arm of a bell crank lever 227s similar to the total key lever 227 and located immediately in rear of the latter. To the depending rear arm of the bell cran 227a is pivoted the rear end of a long plate or bar 216 which is su ported and guided at its Afront end upon a ed stud or rod 202. About midway of its length the bar 216 is dprovided u on its under side with a rearwar y facing ug or shoulder 216" adapted to coperate with a stud 227c rojectmg from `the de ending arm of the ell crank 227, said stug normally occu ying a position immediately in rear of said s oulder 216", as shown in Fig. 2 1 Under this construction and arrangement of the parts, when the subtotal key 293Eie depressed the bar 216 is drawn rearwardly and the engagement of its shoulder 216 with the stud 227 c on the bell-crank 2.27*s of. the total key rocks the latter bell crank upon its ivot and swings its forward end downward in the same manner as if said bell crank were depressed b direct pressure upon the total key 293. l? there were no further provision the link 91 1 controlling the pitman 914 would belowered to the same extent as when the total ke, 293 is directl nl", ing of a totali and clearing the machine, .in the manner before explained; but to p vent the link 911 and front end ofthe pitman 914 from being lowered to such an extent, and to arrest them in the intermediate position shown in Fig. 6, the link is provided near its upper end with a stud/91D into whose path o downward 216 u on the upper edge of the bar `216 is drawn y the rearward movement of said bar due to a depression of the subtotal key 293", as shown in Fig, 6. 'I he contact of the stud 911b with the upper edge of the bar 216 in this manner limits the downward movement of the link 911 and frontend of the pitman 914 and maintains them in the intermediate' position of F' 6, so that upon polliner the operating han le of the machine forward` and movement a locking surface/ depressed by hand in the ta t xalan it. a. subtotal be-xksn-in the manner eretofore uplamed. The slot-andpinconnection of the upper end' of the link 911 with the total key ever227 'ts a full downward movement of thefront end ofl said lever, notwithstan the arrest of the link in the manner desem ed, Vas shown in Fig. 6. A recess 216 in the upper edge of the bar 216, immediatel in rearof the oeksurface 216 on the atter, provides for a ful downward movement of the link 911 and its stud 911h when the total'keyr293 is alone de ressed. he total and subtotal keys and their connections, above described, are now regularly em loyed in the Burro hs machine, but d er from those disclose in the atents to which reference has been made. hey are, however, fully illustrated and described in my pending application Serial No. 336,921, filed October 1, 1906 to which reference may be made for any further explanation of them, as well as for a description of various arts accompanying them. I do not consi er it neocssa to here describe any of such parts, further 1than to point out that the depression of either the total or subtotal ke causes all of the racks 610 to be released y their retainers 415 (as in all Burrou hs machines), this being due to the rearward movement of a release rod 209 which is carried in the front ends of a pair of rearwardly extending arms or links 226 on o posite sides of the machine, the rear end of t e left hand one of the links 226 being connected to the lower end of the depending arm of the bell crank 227, Fig. 2, and the rear end of the right hand one of said links being similarl connected to the lower end of a correspon arm 227 at the opposite side of the machine, Fig. 1, the latter arm being secured at its upper end to the rock shaft 204 to whose o osito end the bell crank 227 at the left han side ofthe machine is secured. The rod 209 carried by the links 226 is sup orted and guided at its o posits ends in s ots in the side frames of t e machine, (not shown) and extends across all of the retainers 415 immediately in front of their rearwardly depending arms or fingers, as shown. When either the total or subtotal ke is de ressed the rod 209 is drawn rearward7 retainers 415 from their corresponding racks 610, to permit the latter to move downward when the operating handle of the machine is drawn forward.

Having now described the means em ployed in the Burroughs machine for disengaging the adding wheel pinions from their actuating racks and reng g them therewith, at'di'erent times analiinder different conditions, depending u on the results to be accomplished, I will exp ain how I make use of such means for` automatically o erating one of the controllingkeysv heretoiiore das ly an serves to disengage all of the scribed (in the-presentinstance the key D) in such manner as to canse. the printing of a total and clearing of one set of a ding wheels to transfer the amount accumulated upon such wheels to the other set of wheels. As shown in Figs. 2, 6, 7 and 16, I provide a bell crank G mounted upon the shaft 904 at the left side of the machine and having the front end of its upper horizontal arm provided vth a slot en agmg a stud I)2 on the controlling ke D; gIhe depending vertical arm of the be l crank G carries at its lower end a pivotcd bell crank plate Gl whose forwardly projecting horiontal arm constitutes a foot adapted to coperate with a stud 911o upon the link 911. A coiled spring G2 yieldingly holds the plate G* in normal position with a laterally project' lng a: uponiis vertical arm resting againstute front edge of the arm of the hell crank G.

When, with the controlling key l) in elevated osition, as in Fig. 6, and the hell crank in corres ondinglr position, the suhtotal key 293 is eprcssed and the link 911 and pitman 914 thereby lowered to their intermediate position, and the operating handle then drawn forward, the stud 911" will take a position immediately in front of the foot G upon the depending arm of the bell crank, as shown in Fig. 6. At the backward movement of the pitman 914, therefore, which occurs at the beginning of the return stroke of the operating handle, as before explained, the lower end of the link 911 will be carried rearward with the itman, and the stud 911', bearing against tlie foot G of tho bell crank lever, will rock the latter upon its pivot 904 and depress the front end of its lorizontal arm (dotted lines Fig. 6), therebyl forcing 'the controllingr key D downward, disengaging all of the detente 926" from the adding wheels B, and releasing the control-- ling key C and permitting the spring 98.0 connected to the detent frame 926 to draw the latter upward into locking engagement with the wheels A. The result of this opqra tion will be, as heretofore ex lained, that the adding wheels A will be loc ed in their zero or initial position. (to which they have been turned by the forward movement of the operatinv' handle and downward movement of the aiding reeks) and um adding wheels B will be left free to rotate and during the re turn upward movement of the adding racks will be turned forward distances corres onding to the backwald movement whic was given the wheels A in returning them to zero, and the amount Previous1 accumulated upon the wheels A be there ore transferred to and added and preserved upon the wheels B. In themannerl and by the means exlplained, therefore, a series of items may be 'stad and accumulated upon the adding wheels A, and the total of such accumulation be said .wheels and the ist wheels be returned to zero, and such total transferred to andadded and preserved upon the wheels B, by simply de ressing the subtotal Dutton 293 of the machine and drawing forward and releasing the operating ,handleI in the usual manner of taking a subtotal; after which the controlling key C (which Will have been released and elevated to u )per osition by the automatic depression o the ey D) may he again depressed (thereby releas- Ving the key D and engaging the detent frame to and lelt in zero position, by operating the machine in the regular manner for the taking of a total; that to say, by depressing the total key .293 and pulling forward and releasing the operating handle. At such operation the controlling key D will be in' depressed position (having been automatically depressed at the taking of the last separate total and clearing of the wheels A,) so that no manipulation of either controlling key is necessary in the taking of such grand' total and clearing of the wheels B.

Fig. 13 of the accom anying drawings-represents the listing of our separate series of items, and the printing of four separate totals at the oots of the respective series, and the final printing,r of a grand total of all of the series, in the manner which has been explainedj. while Fig. l5 represents, in contradistinction to Fig. i3, the taking of two separate subtotals in the course oi the listing of a continuous series of items, and the taking of a final or complete total of the series at the end of operations, in the manner provided for in the regularBurr-oughs machine upon which my present invention is an improvement.

in the present instance, owing to the pro-- vision of means for automatically depressing the controlling hey l). the adding wheels B of my improved machine would he the ones used for accumulating the items anftprinting the subtotnls thereof in the manner indicated in iig. l5. since by employing the vlihcols B for such purpose mntrollinghey i) would he normally de )tossed and would there orc not he mlected )y theoperation of the mechanism prmidcd for its automatic depression when` the items are listed upon the wheels A in the manner heretofore described.

My present invention not only provides for tne printing ol separate totals at the foots of successive series of items in vertical colomns andthe final pn'nti of a grand total, asindicated in Big. 13, but also lends itself to the rinting of separate line-totals at the right han ends of horizontal (instead of vertical) series or lines of items, and the final printing 7o of a grand total of all of the items or separate t ta as indicated in lli'g. l2. The Burroughs machine has heretofore been provided with means rendering it capable of so-called crops addition or accumulation, and the printinglof separate totals at the ends of successive horizontal lines ol4 items, and the printin of a grand total at the foot of the column of 'ne totals, such means bein disclosed t in the pending applications of He er C. Peso ters ,for improvements upon the Burroughs machine, Serial Nos. 207,631 and 255,637 filed May 12, 1904 and April 14, 1905; but my resent invention provides more simple means or the purpose than that heretooredevised. 5 The regular Burroughs machine, for the listlg in of items in vertical columns, is provided with familiar line-spacing mechanism, lv r means of which the aperis automatically a vanced one verticalpline space at each operation ofthe machine, and this mechanism is employed or left operative in the use of the Burroughs machine with m improvement ivhen the latter is employed or the listing of items in vertical columns as heretofore described. When, however, cross addition or accumulation is to be performed, as in lig. 12, such automatic line-spacin 'mechanism is disabled, and means provide for shiftingthe paper carriage one column space (either by -and or automatically) after the printing of each item in "a given line; and after the printing of a total at the end of the line the paper t 1er is then advanced. vertically one space (el by hand or automatically) prior to or durin the return of the paper carriage to rirrht han osition for the beginning of another line. Phe Peters applications above referred to disi close suitable means both for automatically shifting the paper carriage laterally from one 11n column position to another, and for automat- 'i ically line-spacing the paper at the end of each line of items, and l will therefore not illustrate or describe any particular mechanism for that l ur ose in the resent case, since no particulli'r orm'of mec ianisin is essential, and so far as an exp; anation of my invention is concerned it may e assumed that the paper carriage is shifted laterally by hand, and that the aper is also line-spaced hy hand at the egdof cachlineof items. With this understan ing, it will be clear that cross addition or accumulation may be accomplished with my resent invention, in the manner indicated in ig. 12, 4by depressing the controlling key C, then list- A125 ing a series of, items in a horizontal line, andA then, when theend of the line is reached, deressino the subtotal key 293 and pulli orwart and releasing the operating handle o the machine, the result being that a separate total of the singleline of items will have been accumulated u on the Wheels A, and that such total will` e printed at the end of the line, and that said Wheels will be cleared and the accumulation upon them be transferred to and preserved .upon the Wheels B.` Any numbeil of successive horizontal lines of items may be listed in this manner, and thescparate totals of t-he several .lines be printed at the ends thereof, and finally a grand total of all of them be printed at the foot of the right-hand line-total column, as indicated in lig. 12, by depressingl the total key 203 and pulling forward and releasing the operating handle of the machine, such printing of a grand total serving to clear the Wheels B, and thus to leave both sets of wheels clear, ready for succeeding operations, as heretofore explained.

My present invention also lends itself to the listing of two parallel vertical series of items, such as debit and credit columns of items, and the separate and independent accumulation of the items in the two columns, as indicated in Fig. 14. Thus, by setting the paper carriage to 'iosition to cause. the items to be listed in the left-hand column, and depressing the controlling key l), the items will be listed in such column and accuinulated upon the wheels B; while upon shift ing the paper carriage to position to cause the items to be listed. in the right hand column, and depressing the controlling key C, the items will be listed in such rigl'it-hand column and be accumulated upon the wheels A; and at the end ol' operations the footing of the left hand column may be printed from the Wheels B, and the footing of the righthand. column from the wheels A. To facilitute this operation of listing and accumulating items in two separate columns, -and obvi ate the necessity of operating the controlling keys C and l) by hand when the paper carriage is shifted back and forth from 011e coluson to another, in the listing of the individual items, I provide means for placing the controlling keys C and l) under the automatic control of the paper carriage, so that when the paper carriage lis shifted to one 1po sition the corresponding set of aceumu at ing Wheels will be placed in operative connection with the adding racks and transmitting pinions of the machine, and when it is shifted to its opposite position the other set of accunnilatingr Whee s will be placed in operative connection with such actuating devices. To this end I secure upon the transverse rod 1704 mounted in the lower part of the paper earriagc frame at the rear of the machine, Fig. 17', two cams J and JL, each of which Canis is carried by a hub surrounding and free to slide upon thc rod 1704 and provided with a set screw .ll for locking it in its dillerent ad justed )ositions along` said rod. The cams JL? and L are adapted to cooperate with rollers I* journaled in the rearwardly projecting horizontal arms of apair of bell cranks I and IL at the opposite sides of the machine. As shown in Fig. 16, the vertically extendingr arm of the bell crank IL has pivoted to its upper end the ear end of a long link H ex'- tending forward and ivoted at its front end to the bell crank heretofore described. The bell crank IE at the opposite or righh hand side of the machine has the upper und of its vertical arm connected to a second link corresponding to the .linkA H of Fig. 16, and such second link has its front end pivoted to the lower end of the depending vertical arm of a `bell crank K hung upon the shaft 904 at the right side of the machine and having its front end slotted to engage a stud upon the controlling key C, as indicated by the dette( lines in Iig. 16. Under this construction and arrangement of the parts, it will be evi, dent that Whenever the rearwardly pro'eet' ing horizontal arm of either bell crank L or IL is depressed the corresponding key C or D will be likewise depressed and be latchcd depressed position. the cams J and JL are secured upon the rod 1704 in such position that when the paper carriage is in the position shown in Fi .`1'i the cani JL will depress the rear endY o1 the bell crank IL, and consequently depress the controlling key D, as shown in Fi 16,' and when the paper carriage is slid to t e left (to the right in Fig. 17) until the caniJR overrides and depresses the rear end of the bell crank l the controlling key C will be de Y pressed, and the key D be released and lifted by its spring 980. In the former position of the paper carriave, therefore, the items listed will be printed 1n the left hand column and be accumulated upon the addingr wheels B, While in the latter position of the paper carriage they will be listed in the right hand column and accumulated upon the adding wheels A. The more shifting of the paper carriage back and forth, from one columnar position tothe other, therefore automatically throws the accumulation into the corresponding set of adding wheels; and at the end of operations a total of the items in eachcolumn may be printed from the corresponding set of wheels byoperating the machine in the usual manner in connection with the total key 293, such o eration leaving both sets of adding Wheels c ear and ready for the accumulation of additional columns of items. When the machine is being used for other than double column .Work the cams JL- and JL will be turned upon the rod 1704 to inoperative positions, for which purpose the rod is provided with two longitudinal grooves, with the lower one of which the set screws i engage when the cams 'are to be secured in operative position, asA in Fig. 17, and with the upper one of which they may be engaged when the cams aresturhedto inoperative posi? i s Lf" As shown in Fig. 17,`

. at each complete In the regular Burroughs machine, having a single set of adding wheels,` provisionY is made (as in Vall adding machines) for causing each wheel in the series, when it completes a revolution, to advance the ne'xt higher wheel one step; and in the present instance I have modied and supplemented such carrying or transferring .mechanism in such a way as to take care oi both of the sets of adding wheels with which my improved machine is provided, so that when an wheel in either set completes a revolution t e next higher wheel in that set will be advanced one step.' The modified and supplemental devices which I have provided for this purpose are' best shown in l 2, 3,' 4, and 5, reference being also had` to 9 and 11. As shown in the latter iigures, the adding wheels A and B of each pair are provided with inwardly. projecting studs Al and B, which studscoirespend in purpose Vand inaction with the radial arms or cams'924 of there lar Burroughs machine; that is to say, Veac operates revolution `ofy the wheel which carries it to which controls the carrying or transfer movement of the adding rack whichfccper` ates with the next higher wheel in the series, and each also operates as a stop arm to arrest its wheel at zero position when the wheels are turned backward in the taking of a total or subtotal. to consist in the present, instance of longlii'- regularly shaped arms 413 at t eir upper ends upon and depending rom fixed ivotal supports 413"r at their up r-ends, `ig. 5. Each oi these detent arms 413 (except the extreme .left-hand one,' u

rovided about midway of its length with a ug 413 projecting laterall toward the left, Figs. 1, 2, 4 and 5. Coile springs 480 connected at their lower ends to! the detent arms 413 tend to swing the lower ends of said arms forward and serve to yieldinfgly maintain them in normal sition, with Vorwardly projecting arms or ugs front edges resting in contact with the ixed shaft 205 of the machine, asshown in Fig. 2. In this position of the detent arms 413 the lu 413 projecting laterally to the left from eac of said arms overlies a stud 651 carried b the adding rack 610 which cooperates wit the pinion 9 16 of the next higher ps ir of adding wheels in the series, as shown in dotted lines in Figs. 1 and 2.` Each of the adding racks 610 is mounted upon its corresponding lever'll by a slot-and-pin connection as shown, and spi-in 680 connected at pir upper ends to the evers (or the pins carried by them) and at their lower ends to the lower extremities of the racks 610 exert an upward pull upon the racks, and tend to move them i1 ward relatively to the respective levers w ich carry them. y.f In the normalllposition of the parts, Figs. 1 and 2, the o y thing `651 of the racks.

trip detent orr'latch.

The .detente referredl Fig. `2) is s ondii liJurroug vicine which restrains theracks from such upward movement is the engagement of the lugs 413 of the detent or sto arms 413 with the studs onsequeritlly, if, with the parte in thepositionshown in figs. 1 and 2, the lower end of any detent arm 413 be swu rearwardly far enough to carry its lug 413 out of the path of the stud 651 upon the corresponding rack, the latter will instantly-ipring upward until arrested b the contact f the lower wall of its slot with the pin or stud oi the lever which carries it, as shown in Fig. 5. The length of the slots in the racks is such that when a rack is thus moved u ward bfy its spring as far as the length o its slot will ermit the adding wheel inion in mesh with such rack' will be turn one step or the fpace of one tooth. Whenany adding wheel completes a revolution its pin B, during the last step of such revolution, will contact with the rounded or beveled lower end'l" of the correspondi detent arm 4,13Y and force the latter rearwar rto the position shown in Fig. 5, where the adding wheel B is represented as having come to rest at exactly the end of a complete revolution, so that its stud Bx is shown as just having passed and cleared the lower end of the detent arm 413. The adding rack 610 is there shown as having 'been lifted b its spring 680, upon the disengagement o the lug 4:13'l from its stud 651,to advance the next higher wheel in the series one step and eect t e transfer.

The rack 610 shown in Fi 1, being the extreme right handV one in t e series, performs no carrying function and hence is not provided with any stud 651, the stud 651 shown in dotted lines in said view beingthe stud carried by and projecting from the ri ht side of the second rack in the series. So, so, the detent arm 413 shown in Fig. 2, being the extreme left hand one in the series, cooper# ates with no rack and hence is not rovided with any lug 413, the lug 413 s own4 in dotted lines in said view being the lug carried by and projecting to the left from the next `detent arm 413 to the right of the one shown in Fig. 2, beyond the rackrl() there shown` and coperating with the'stud 651 carried'by and projecting to the right from said rack.

. The carryin is not materia y different from the corremechanism em loyed in the regular machine, an is suicient t-o take wheels of the B set; but as it is also essentie that the transfers between the wheels of the A set shall likewise be taken care` offI provide the additional devices to be now described.

Hung upon the same pivotal support as the detent arms 4 13is a second series Vof detent arms 413th Figsl and 4, whose lower ends are shaped like the lower ends of the detent mechanism so far described arms 413 and areA adapted to co the studs A of the adding whee s A in the same manner that the lower ends of the arms 413 co erate with the stud B1 of the wheels B. Each of the detent arms 413% (except the extreme left hand one) is provided near its upper end with a lug or stud 4134, whose left hand end projects immediately in front of a lug 413c upon the right side of the adjacent detent arm 413, Fig. 4. It results from this provision that whenever the lower end of a detent arm 4134 is swung rearward by the stud A of its corresponding adding wheel A, as said wheel completes a revolution, said detent arm will carr the adjacent detent arm 413 at the left with it, the two arms moving in unison as a single part; and as the lug 413n of the detent arm 413, of such pair controls the adding rack 61() which meshes with the transmitting pinion of the next higher pair of adding wheels in the series, it foilows that such adding rack will be released and be permitted to move u ward one step beyond normal position, and) thereby advance the adding Wheel A of such higher pair'one step to eiiect the transfer.

As will be understood from the foregoing, when an adding wheel B completes a revolu- -tion the corresponding detent arm 413 is swung rearward independently of the detent arm 4134 which co crates with the asson ciated adding wheel but when any detent arm 413% is swung rearward by the complete revolution of the corresponding adding wheel of the; Burroughs usually or more often tripped b the revohl- A it carries the detent arm 413 of the asso ciated adding wheel B with it. This provision for the movement of the detent arms in unison in one case, and for the independent movement of the arm 413 in the other, is not essential, and is a mere incident to the more convenientcostruction and arrangement of .the parts in the present instance; and where at can be conveniently done the two detent arms may be connected together as one member or be formed integral with each other. A

The foregoing explanation of the carryingv mechanism has assumed that the adding racks and their levers 611 were in normal position when the racks were released by the detent arms 413 to effect the transfers, so that the racks would be immediately drawn upward the space of one step by their springs to effect such transfers; but in the operationmachine the detents are i '1s of the correspon( ing a ding wheels me levers and racks are out of normal.

. difm, and during the time they are rcturning to such posltion and are conserpientiy i1: the act of turning the adding whee s; and it is therefore necessary to provide means for wtling the detent arms 413 in displaced posi, ion-,ff after they have been tripped hy the studs A* B1 upon the adding wheels, until,

erate with 1 the levers and adding racks are returned to normal position, so that the racks may then effect the transfers b movingmi upward one step beyond normalv position owin0r to the fact that the stop'lugs which normal y arrest them have been displaced from their paths of movement. For this purpose latches 411 are provided, whose lower ends cooperate with arms projecting forwardly from the j upper ends of the detent arms 413, as shown in Fig. 5. When the lower end of any detent arm 413 is swung rearward to the position shown in Fig. 5 the corresponding latch arm I 411 will engage the upper horizontal arm of the detent 413 in such a way as to latch the detent in its displaced position, the latch arm 411 being moved in such instance by the spring 48() from the position oi the dotted i lines 1n Fi 5 to the position of the solid ones, At thc end of each operation of the machine all of the latch arms which have been displaced in this manner are swung back to normal position, thereby unlatohing the detent l arms 413 and permitting the springs 48() to swing their lower ends forward again as soon as the displaced racks 610 are drawn downL ward to normal position and their studs 651 carried below and out of the path of forward movement of the lugs 413a on the detent arms. This occurs at the beginning of the succeedin'g operation of the machine, as in the regular Burroughsmachine, the racks being drawn downward to normal Jmsition by the lowering of the front ends oil the levers 611 one step from their normal position, the studs of the levers which pass through the slots in the racks serving at such time to carry mal position at such movement of the levers. As before stated, the studs A1 B1 of the adding wheels not only serve to displace the detent arms in the carrying operation, but also serve to arrest the adding wheeis at zero position when turned backward in the taking of totais. To this end the hooked lower ends 413b of the detent arms are provided with abrupt upper surfaces approximately radial to the axis of the adding wheels, and as these hooked lower ends of the detent arms normally project into the path of the studs B1 l upon the wheels B it follows that when the latter wheels are turned backward their studs will Contact with such stop surfaces of the de- F tent arms and arrest the wheels, (dotted lines Fig. 2), and the relative adjustment and arrangement of the parts are such that the y wheels when so arrested will stand in zero position. The hooked lower rnd of the arms 413ilikewise cooperate `with the studs lAl of the adding Wheels A to arrest said l wheels at zero when they are turned backward in totaling operations.` The cxtreme y left hand pair of arms 413 and 4123!, coperate with no rack, and their sole function is to i arrest the left hand pair of wheels A B at the displaced racks downward to norzero position when turned backward thereto in totaling operations.

Having thus fully described my invention, I claim:

1. In an adding machine, the combination, with the adding racks and their operating and controlling devices, of two sets of adding wheels associated in pairs with the respective racks, means for normally transmitting the movement of the racks in one direction to one set of wheels only, and means operable at will to cause the racks automatically to rst transmit their reverse movement to said set of Wheels and then their opposite movement to the other set of wheels.

2. In an adding machine, the combination, with the adding racks and their o erating and controlling devices, of two sets o adding wheels associated in pairs with the respective racks, means for causing theA racks to transmit their movement in one direction to either set of wheels at will, and means o erable at will to cause the racks automatically to first transmit their reverse movement to suchv moved set of Wheels and then their opposite movement to the other set of wheels.

3. In an adding machine, the combination, with the adding racks and their operating and controlling devices, of two sets of adding wheels associated in pairs with the respective racks, means for causing the racks to normally transmit their movement in one d irention to one set of said Wheels, ymeans operable at will to cause the racks automatically to lrst transmit their reverse movement to said set of wheels and then their o posite movement to the other set of whee s, and means for subsequently causing the racks to transmit their reverse movement to the -last mentioned set of Wheels.

4. In an adding machine, the combination, with the adding racks and their o erating and controlling devices, of a series o pinions operated hy the respective racks, two sets of adding wheels associated in pairs with the res ective pinions, and means for transmitting the movements of the pinions to either set of addin wheels at will.

5. n an adding machine, the combination, with the adding racks and their o erating and controlling devices, of a series o pinions operated by the respective racks, two sets of adding wheels associated in pairs with the respective pinions, means for transmitting the movements of the inions to either set of adding wheels at wi and means forcausin the complete revolution of each addingwhee to advance the corresponding wheel of the next higher air one step.

6. In an a ding machine, with the addin racks and their o and controlling eviccs, of a seriesio pim ns operated by the respective racks, two set f adding wheels associated in pairs Withthe respective pinions, means for transmitting. the

the combination,

erating movements of the pinions to one of saidsets of adding wheels, and means for returning y said set of Wheels to zero osition and correspondingly advancing t e other set of Wheels.

7. In an adding machine, the combination, with the adding racks and their operating and controlling devices, of a series of pinions operated by the respective racks, two sets of adding wheels associated in pairs with the respective pinions, means for normally transmitting t .ie movement of the inions in one operable at will for causing the racks to turn the pinions in the reverse direction and to transmit suoli reverse movement of the inions' to said set of adding Wheels and t eir opposite movement to the other set of w eels.

8. In an adding machine, the combination, with the adding racks and their operating and controlling devices, ola series of pinions operated by the respective racks, two sets of adding wheels associated in pairs with the respective pinions, means for transmitting the 'movements of the inions to either set of adding wheels at Wi and means for returning either set of Wheels to zero position and l correspondingly advancing the other set of l wheels.

U. In an adding machine, the combination, with the adding racks and their o erating and controlling devices, of a series o pinions operated by t e respective racks, two sets o adding wheels associated in pairs with the respective racks, meansior causing the pinions to normally transmit their movement in one direction to one set of said wheels, means operable at will to cause the racks to turn the pinions in the reverse direction and to transmit such reverse movement of the pinions to said set of wheels and their opposite movement to the other set of w eels, and means for subsequently causing the pinions to transmit their reverse movement to the last mentioned set of wheels without moving the other set of wheels in l either direction. m

10. In an adding machine, tion, with the addin ing and controllin r i ions engageable with and disengageable from said racks, means for maintaining said inions out of engagement with the racks uring the movement of the latter in one tion and in engagement with them during their movement 1n 'two sets of addi with -the respective pinions, g

.transmitting the movements Vof the'pinions to either set of wheels at will.

i 1l. In an adding machine,

tion, with the addin ing and controlling ions engageable with and disengageable om direction to one set of whee s, and means the combined racks and their operat- 1ro evices, of a series of pinthe combnllracks and their operaA evices, of a series of iniis izo 

